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Metal Detector

P

paul

Jan 1, 1970
0
Does anyone have any experience with metal detector circuits ?

I have a circuit for a BFO type detector but have read that this
design is quite old and that 'pulse induction' designs are considered
far better.

I also have a design for a detector which uses a faraday shield on the
coil. The design states this has to be constructed using 'tin' foil,
and not 'aluminium foil'. Is this correct ?

Any circuit ideas would be appreciated.

Thanks

Paul Smith
 
J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that paul <[email protected]>
I also have a design for a detector which uses a faraday shield on the
coil. The design states this has to be constructed using 'tin' foil, and
not 'aluminium foil'. Is this correct ?

Almost certainly not. Tin has a much higher resistivity than aluminium,
so it just MIGHT be that the coil Q is OK with tin but not aluminium.
You can solder to tin, of course, if you use a very cool soldering iron.
But where could you get (and afford!) real tin foil these days?
 
T

Tweetldee

Jan 1, 1970
0
paul said:
Does anyone have any experience with metal detector circuits ?

I have a circuit for a BFO type detector but have read that this
design is quite old and that 'pulse induction' designs are considered
far better.

I also have a design for a detector which uses a faraday shield on the
coil. The design states this has to be constructed using 'tin' foil,
and not 'aluminium foil'. Is this correct ?

Any circuit ideas would be appreciated.

Thanks

Paul Smith

Gary Lecomte has a pulse induction metal detector project at
http://www3.telus.net/chemelec/Projects/Metal/Metal.htm. It appears to be a
pretty solid design. I've started collecting the parts for the project, but
haven't started building it yet.
--
Tweetldee
Tweetldee at att dot net (Just subsitute the appropriate characters in the
address)

Never take a laxative and a sleeping pill at the same time!!
 
I

Ian Stirling

Jan 1, 1970
0
John Woodgate said:
I read in sci.electronics.design that paul <[email protected]>


Almost certainly not. Tin has a much higher resistivity than aluminium,
so it just MIGHT be that the coil Q is OK with tin but not aluminium.
You can solder to tin, of course, if you use a very cool soldering iron.
But where could you get (and afford!) real tin foil these days?

You can hammer out lead-free plumbing solder pretty easily.
 
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